To dream about a great flood, and worse if the water is dirty, suggests that the dreamer and his/her family will face negative situations. To dream about people that are swimming in a flood, and are agonizingly trying to save their lives, suggests that the negative situations that are soon to come will affect many people (may be an economic crisis, epidemics, etc.). To dream about a flood but that its water is very clear, clean and calm indicates that the negative situations that the dreamer and his family are experiencing are mild and will soon pass.